How to correlate a value if it is generated from random function at runtime. I am not able to correlate that value as there are no left and right boundaries.
What do you mean by "random function"? Is it generated by a Javascript? Or can you see your random value from a server response?
You can only extract a value if it's coming from a server response. If your value is generated by a Javascript then you need to use the same code in a NeoLoad Javascript to generate your random value.
Or sometimes depending on the format of your value you could also use a NeoLoad variable.